It is possible you are correct, but I don't think so. In most places, police shootings are looked at by the department, by the District Attorney, by a Grand Jury - - - or all three. I doubt any but the most stupid cop would feel a license to kill. Oh, and that's not to mention civil court cases...
More likely, moods of potential victims have changed. Once upon a time, "Its safer not to resist a hijacking" and "Give the criminal what they want" were thought to be the 'safer' advice..... well, 9/11 definitively demolished the former. Passengers have been fighting back - and successfully. As to the latter, too many learned too late that what the criminal wanted was to rob, torture and murder their family. People perhaps are waking up to the nature and aims of both terrorists and domestic predators.